another constructor for CameraPositionWidget for displaying image by also using field of view instead of intrinsic matrix

remove VIZ prefix from rendering properties, fix setRenderingProperties and getRenderingProperties methods

delete common.h, viz_types.hpp, rendering properties are public, setcolor in creating_widgets tutorial

Low order tasks

load mesh function is finalized: color range is always 0-255 and RGB due to vtkPLYReader limitations